import matplotlib.pyplot as plt
import numpy as np

y = np.array([35, 25, 25, 15])

plt.pie(y,
        labels=['A', 'B', 'C', 'D'],
        colors=['red', 'green', 'blue', 'purple'],
        explode=(0, 0.2, 0, 0),
        autopct="%.2f%%"
        )
plt.title('hello')
plt.show()
